Such an significant drop in IQ does not seem plausible for me. Sure the brain of adolescents is a bit more sensitive but just from fighting once or twice? These are street fights so most of them donít even know how to punch properly.

The only way I could imagine a significant drop of IQ is when the victim is on the ground and gets repeatedly kicked in the head or similar stuff.

Anyway, so they found some correlation. So what?
Is it really surprising that people that get into street fights end up more stupid than the ones that stay at home and study?
Do we need to make bullshit theories about it?

Oh god, I love these scientific studies. It also shows that the average IQ drops with age significantly between the ages of 13 to 31. Theories have been broughtup on why that is but the study was flawed in the beginning only pointing to one source. So let's see how they skewed these facts.

(Wanna bet that these guys should have been punched in the head a few times after they did this study?)

I wasn't totally clear on the research methods, but isn't it possible that this is the result of people with lower IQs getting into more fights?

That's the first thing I thought. Even with before/after tests, IQ is so murky, I don't know how you could claim conclusive results.

For example, IQ compares one to one's peers. Fine, this keeps youngsters from being categorized as deficient. Well, if your development plateaus early, you fall behind your peers, you get into fights because you're not socializing properly, and your IQ tests lower.

They're going to have to demonstrate physical evidence of brain injury to prove anything, IMO.

I'd like to go on record folks that "if" you actually took a real IQ test it would take between 3-5 hours to complete. It consist of several different areas of exams and takes a few days to calculate the results. Anything else and you took a novelty test. In order for these facts to hold true. You would have to do a proper IQ test on a subject, have that subject get hit in the head a few times over a few years and recalculate that IQ test weighing in all factors that could corrupt the outcome.